Hmm. Our resident metal head, Batlord, will be able to set you straighter than I could, but I know both Grave Digger and Gamma Ray are considered Power Metal. I don't think it's a different sub-genre just because there are growled vocals. Let me listen to the others in the meantime and I'll get back to you.
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Trollheart: Signature-free since April 2018
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